Conversely, you can also come by anti-humectants, which are used in hair care products to fight the effects of humidity (principally frizziness) and keep hair smooth and pristine. Incidentally, if anyone can work out how to transfer the moisture from frizzy hair to dried-out skin (or cereal bars) a fortune surely awaits them.

The word comes from the Latinhumectans, the present participle of humectare (to moisten) from humectus (moist).